Experimental assessment of tropical surface ozone related to land utilization in Central Thailand

Autor(en)

Parkpoom Choomanee, Surat Bualert, Thunyapat Thongyen, Kittichai Duangmal, Alongkorn Intaraksa, Thitima Rungratanaubon, Wladyslaw W. Szymanski

Abstrakt

Surface ozone (O₃) is a harmful air pollutant that is created through complex atmospheric photochemical reactions between nitrogen oxides (NO_x) and various precursors. Its abundance depends on the associated chemical pathways, local environmental conditions, and meteorological factors, the latter of which affects the dispersal of O₃. This research investigates vertical and horizontal variations in NO₂ and O₃ in urban and rural areas associated with atmospheric parameters at 13 monitoring locations stretching from greater Bangkok to Ratchaburi Province, Thailand. O₃ and NO₂ were measured concurrently with temperature and relative humidity using calibrated portable devices (Aeroqual, Series 500), typically at heights of 1.5, 75, and 110 m. The instruments were mounted on a drone to obtain measurements at elevations of 75 m and 110 m. The data obtained showed that even in the lowest part of the boundary layer, the average concentrations of O₃ in the urban area increased by nearly 21% with altitude from the ground (26.8 ± 4.7 ppb at 1.5 m) to 110 m. However, in the rural area, the average ground concentrations of O3 were higher (38.6 ± 11.8 ppb) but they decreased by approximately 43% at 110 m. Notably, at all monitoring sites, NO₂ concentrations exhibited a decreasing trend with height above the ground. As the wind conditions were stagnant, the ground measurements at each station were representative of local conditions. However, modelling of air mass backward trajectories indicated that despite the stagnant conditions at the ground level, there were contributions from long-range transport (even within the shallow atmospheric layers) at elevations as low as 110 m above the ground.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Kasetsart University

Journal

Atmospheric Environment: X

Band

11

Anzahl der Seiten

12

ISSN

2590-1621

DOI

https://doi.org/10.1016/j.aeaoa.2021.100129

Publikationsdatum

08-2021

Peer-reviewed

Ja

ÖFOS 2012

103037 Umweltphysik, 103039 Aerosolphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Umweltwissenschaft, Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/798938e9-6dda-4cfc-bbd9-235d30fc6613